I want to write in TeX this sign:

(Put in headings for bigger size). What's the syntax?

  • 3
    \stackrel{?}{=} Oct 7, 2014 at 21:33
  • 2
    What @PrzemysławScherwentke said. Or \questeq (or use the unicode character directly) with \usepackage{unicode-math}. Oct 7, 2014 at 21:36
  • @PrzemysławScherwentke:I came across this one but it seems to not render with MathJax. When trying to put it inside two $s it doesn't come out.
    – E Be
    Oct 7, 2014 at 21:37
  • 4
    What MathJax may or may not do has nothing to do with (La)TeX! Oct 7, 2014 at 21:39
  • 1
    Note that \stackrel is unknown in plain TeX. The syntax in plain TeX is \buildrel ?\over =. You can try if this syntax is working in MathJax (I don't know).
    – wipet
    Oct 8, 2014 at 8:36

1 Answer 1


It is not a long answer, and working in LaTeX, not plain TeX, but according to Werner's suggestion...


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